Zobrazeno 1 - 10
of 3 729
pro vyhledávání: '"ION, I."'
Autor:
Dinca, Ion I.
We prove that a generic $4$-dimensional integrable rolling distribution of contact elements with the symmetry of the tangency configuration (excluding developable seed and isotropic developable leaves) splits into an $1$-dimensional family of generic
Externí odkaz:
http://arxiv.org/abs/2410.01135
Autor:
Cotaescu, Ion I.
Publikováno v:
Eur. Phys. J. C (2024) 84:819
New one-parameter models of non-rotating dynamical particles are derived as isotropic solutions of Einstein's equations with perfect fluid in space-times with FLRW asymptotic behaviour generalizing thus the models proposed recently in [I. I. Cot\u ae
Externí odkaz:
http://arxiv.org/abs/2408.06389
Autor:
Dinca, Ion I.
We provide the B\"{a}cklund transforms of Peterson's isometric deformations of diagonal higher dimensional quadrics without center. These are found explicitly. can be iterated via the Bianchi Permutability Theorem and can be further iterated via the
Externí odkaz:
http://arxiv.org/abs/2308.08826
Autor:
Cotaescu, Ion I.
New conserved spin and orbital angular momentum operators of Dirac's theory on spatially flat FLRW spacetimes are proposed generalizing thus recent results concerning the role of Pryce's spin operator in the flat case [I. I. Cot\u aescu, Eur. Phys. J
Externí odkaz:
http://arxiv.org/abs/2308.05781
Autor:
Ion I. Cotăescu
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 8, Pp 1-8 (2024)
Abstract New one-parameter models of non-rotating dynamical particles are derived as isotropic solutions of Einstein’s equations with perfect fluid in space-times with FLRW asymptotic behaviour, thus generalizing the models recently proposed by Cot
Externí odkaz:
https://doaj.org/article/c389a4c74aff4f74a97adb5a2dd5c489
Autor:
Cotaescu, Ion I.
The quantum theory of free Dirac's massive fermions is reconstructed around the new conserved spin operator and its corresponding position one proposed initially by Pryce long time ago and re-defined recently with the help of a new spin symmetry and
Externí odkaz:
http://arxiv.org/abs/2304.12182
Autor:
Ion I. Cotăescu
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 5, Pp 1-13 (2024)
Abstract New conserved spin and orbital angular momentum operators of Dirac’s theory on spatially flat FLRW space-times are proposed generalizing thus the recent results concerning the role of Pryce’s spin operator in the flat case (Cotăescu in
Externí odkaz:
https://doaj.org/article/a5881bd57afd43d3879fa961423ff43c
Autor:
Cotaescu, Ion I., Cotaescu Jr, Ion
The discrete symmetries of the Dirac field on the de Sitter manifold are studied taking into account that this has two portions that can play the role of physical space-times, namely the expanding and a collapsing universes. The proper discrete isome
Externí odkaz:
http://arxiv.org/abs/2212.13435